一个1602显示超声波测距的例程

ID:249737 · 发表于 2017-12-12 19:57

SMC1602A(16*2)模拟口线接线方式
连接线图:
   ---------------------------------------------------
   |LCM-----51 | LCM-----51 | LCM------51    |
   --------------------------------------------------|
   |DB0-----P1.0 | DB4-----P1.4 | RW-------P3.4 |
   |DB1-----P1.1 | DB5-----P1.5 | RS-------P3.3 |
   |DB2-----P1.2 | DB6-----P1.6 | E--------P3.5 |
   |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
   ---------------------------------------------------
接线：模块TRIG接 P2.6  ECH0 接P2.7

本程序源码只供学习参考，不得应用于商业用途，如有需要请联系作者。

[注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M]
=============================================================*/
#include <reg52.H> //器件配置文件
#include <intrins.h>
sbit RX=P1^7;
sbit TX=P1^6;

sbit LCM_RW=P2^5; //定义LCD引脚
sbit LCM_RS=P2^4;
sbit LCM_E=P2^6;
#define LCM_Data  P0

sbit Key_Data=P2^0; //定义Keyboard引脚
sbit Key_CLK=P3^2;

#define Busy 0x80 //用于检测LCM状态字中的Busy标识

void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);

unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code mcustudio[] ={"mcustudio.com.cn"};
unsigned char code email[] = {"fhwxaoo@163.com "};
unsigned char code Cls[] =    {"             "};
unsigned char code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.','-','M'};

static unsigned char DisNum = 0; //显示用指针
   unsigned int  time=0;
   unsigned long S=0;
   bit    flag =0;
   unsigned char disbuff[4]    ={ 0,0,0,0,};

//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高可以在这后加小的延时
LCM_E = 0; //延时
LCM_E = 1;
}

//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCM(); //根据需要检测忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}

//读数据
unsigned char ReadDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}

//读状态
unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF;
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while (LCM_Data & Busy); //检测忙信号
return(LCM_Data);
}

void LCMInit(void) //LCM初始化
{
LCM_Data = 0;
WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();

WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCM(0x08,1); //关闭显示
WriteCommandLCM(0x01,1); //显示清屏
WriteCommandLCM(0x06,1); // 显示光标移动设置
WriteCommandLCM(0x0F,1); // 显示开及光标设置
}

//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
X |= 0x80; //算出指令码
WriteCommandLCM(X, 1); //发命令字
WriteDataLCM(DData); //发数据
}

//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char ListLength;

  ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
while (DData[ListLength]>0x19) //若到达字串尾则退出
{
if (X <= 0xF) //X坐标应小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
ListLength++;
X++;
}
}
}

//5ms延时
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}

//400ms延时
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}
/********************************************************/
void Conut(void)
{
   time=TH0*256+TL0;
   TH0=0;
   TL0=0;

   S=(time*1.7)/100;    //算出来是CM
   if((S>=700)||flag==1) //超出测量范围显示“-”
   {
   flag=0;

   DisplayOneChar(0, 1, ASCII[11]);
   DisplayOneChar(1, 1, ASCII[10]); //显示点
   DisplayOneChar(2, 1, ASCII[11]);
   DisplayOneChar(3, 1, ASCII[11]);
   DisplayOneChar(4, 1, ASCII[12]); //显示M
   }
   else
   {
   disbuff[0]=S%1000/100;
   disbuff[1]=S%1000%100/10;
   disbuff[2]=S%1000%10 %10;
   DisplayOneChar(0, 1, ASCII[disbuff[0]]);
   DisplayOneChar(1, 1, ASCII[10]); //显示点
   DisplayOneChar(2, 1, ASCII[disbuff[1]]);
   DisplayOneChar(3, 1, ASCII[disbuff[2]]);
   DisplayOneChar(4, 1, ASCII[12]); //显示M
   }
}
/********************************************************/
   void zd0() interrupt 1    //T0中断用来计数器溢出,超过测距范围
  {
flag=1;    //中断溢出标志
  }
/********************************************************/
   void  StartModule()          //启动模块
  {
   TX=1;                      //启动一次模块
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   TX=0;
  }
/********************************************************/
void delayms(unsigned int ms)
{
unsigned char i=100,j;
for(;ms;ms--)
{
while(--i)
{
j=10;
while(--j);
}
}
}
/*********************************************************/
void main(void)
{
unsigned char TempCyc;
Delay400Ms(); //启动等待，等LCM讲入工作状态
LCMInit(); //LCM初始化
Delay5Ms(); //延时片刻(可不要)
DisplayListChar(0, 0, mcustudio);
DisplayListChar(0, 1, email);
ReadDataLCM();//测试用句无意义
for (TempCyc=0; TempCyc<10; TempCyc++)
Delay400Ms(); //延时
DisplayListChar(0, 1, Cls);
while(1)
{
   TMOD=0x01;    //设T0为方式1，GATE=1；
   TH0=0;
   TL0=0;
   ET0=1;          //允许T0中断
   EA=1;    //开启总中断

while(1)
   {
      StartModule();
// DisplayOneChar(0, 1, ASCII[0]);
      while(!RX); //当RX为零时等待
      TR0=1;       //开启计数
      while(RX); //当RX为1计数并等待
      TR0=0; //关闭计数
      Conut(); //计算
   delayms(80); //80MS

   }
}
}

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